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  <p>HTML——超文本编辑语言</p>
  <h1>标题标签h1-h6,目前是h1</h1>
  <a href="www.baidu.com">这是a标签，跳转到百度首页</a>
  <img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/0cb52d4a506e44aba88bc0f2e8a8b2b7~tplv-k3u1fbpfcp-zoom-1.image" alt="图片标签">
  <p>换行使用<br /> br标签</p>
  <b>定义粗体文字</b> <br />
  <em>定义着重字</em><br />
  <i>定义斜体</i><br />
  <small>定义小字号</small> <br />
  <strong>定义加重语气，加粗</strong> <br />
  <sub>定义下标字</sub> <br />
  <sup>定义上标字</sup> <br />
  <ins>定义插入字</ins> <br />
  <del>定义删除字</del> <br />
  <table border="2">
    <caption>标签</caption>
    <tr>
      <th>第一个1</th>
      <th>第一个2</th>
    </tr>
    <tr>
      <td>一行一列</td>
      <td>一行二列</td>
    </tr>
    <tr>
      <td>二行一列</td>
      <td>二行二列</td>
    </tr>
  </table>
  <ul>
    <li>无序列表</li>
    <li>1</li>
    <li>2</li>
  </ul>
  <ol>
    <li>有序列表</li>
    <li>1</li>
    <li>2</li>
  </ol>
  <form action="">
    username：<input type="text">
    password:<input type="password">
  </form>
  <p>
    input 标签type属性对应值，text-文本，password-密码，radio-单选，checkbox-复选框，submit-提交按钮
  </p>
  <input type="range" name="" id="">
  <p>HTML5中的语意元素</p>
  <header>header</header>
  <nav>nav</nav>
  <article>
    article
  </article>
  <aside>aside</aside>
  <footer>footer</footer>
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